Some details of IRA aid to MK, ANC's military wing were revealed by Kader Asmal, a South African minister, in a biography published in 2011.
While living in exile in Dublin, Mr Asmal was a member of the ANC, but opposed IRA violence and had no links to Sinn Fein.
So, when the ANC asked him to secure military training from the IRA, he turned for help to Mick O'Riordan, leader of the Communist Party of Ireland.
He wrote that after Mr O'Riordan contacted Gerry Adams, IRA explosives experts gave MK militants a fortnight's training at camps in Angola.
IRA members later carried out reconnaissance on south Africa's Sasolburg oil refinery in preparation for an MK attack.